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Physical Science
Shells Levels :
Electron shells also called a principal energy level, is defined as an orbit that contains electrons ( discovered by J.J. Thomson) around the nucleus of the atoms.
Subshells :
Each shell is composed of one or more subshells ( depends on where is placed on the atom) which are themselves composed of atomic orbitals. This orbitals take place on the little spaces that separe each shell.
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